With today’s announcement of iBooks Author and iBooks 2, Apple intends on making expensive, bulky textbooks and exploding book bags a thing of the past. But one thing they didn’t mention is that while an iPad 2 may be thinner than a traditional textbook, iBook textbooks gain bulk in a different way: the files are absolutely huge.

Along with music, movies and photos, many people have some mysterious “other” data on their iDevices, which seems to increase over time. One reader is wondering how to get rid of this data and free up space:

When I look at my iTunes summary of my iPad it shows that there is 2.9GB of “Other” stored on my device. I haven’t put much stuff on my iPad and have no idea what is taking up so much space. I only have a 16GB iPad and like to put movies on it for when I travel, so space is a premium. How do I find out what is taking up so much space, and what is the best way to maximize storage space on my iPad?